I tried with the suggestion you provided. But I got another warning in checkout page:Warning: Invalid argument supplied for foreach() in #some-path#wp-content/plugins/wp-hummingbird/core/modules/class-module-page-caching.php on line 2035

I found out the loop were started without confirming if the values that is going through iteration actually has the values in it. So, I wrapped that code with "if" condition.

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